Fountain pen



Aug. 11, 1931. L. A. BROOKE FOUNTAIN PEN Filed Aug. 22, 192s Patented Aug. 11, 1931 LLOYD A. BROOKE, OF WASHINGTON, DISTRICT F COLUMBIA FOUNTAIN PEN Application led August 22,1929. Serial No. 387,710.

The invention relates to an improved fountain pen of simple construction and large ink capacity, comprising a main barrel open at both ends, one end having a seat for the feed plug the inner face of which constitutes a valve seat, a tubular plunger fitting the bai rel, the lower end of which forms a valve to close the feed duct in the plug, when the pen is not in use, and an outer sleeve secured to the upper end of the plunger and constituting a stop to limit the movement of the plunger in the filling operation.

The invention is illustrated in the accompanying drawings, in which Fig. 1 is a vertical sectional elevation of the pen.

Fig. 2 is a cross section on line 2 2 of Fig. 1. f VReferring to the drawings, 1 indicates the main barrel or body of the pen, which is formed of a tube open at both ends, the lower end being provided with a seat 3 to receive a feed plug 6, which latter is provided with the usual longitudinal feed duct conventionally illustrated at 7, the usual pen point or nib 9 being secured between the plug and the lower end of the barrel in the customary relation. The inner face of the plug 6 is formed with a valve seat 8, which is preferably conical. The upper end of the barrel 1 is provided with an exteriorly threaded fiange 5.

Slidably mounted in the barrel 1, with a substantially liquid-tight fit, is a tubular 35 plunger 10 having a closed uper end 11, preferably formed as a. tapered head to receive the usual cap, such as 20, when the latter is removed from the nib end. Below the n head 11, the plunger is provided with a series i of external screw threads, formed on a shoulder somewhatV larger than thel diameter of the plunger. The lower end of the plunger has a central opening 13, which is surrounded by a flange 14, the lower face of which constitutes a valve adapted to be moved into and out of engagement with the valve seat S on the plug 6, and, therefore, operates to open and close the feed duct 7.

Telescopically engaging the main barrel l is a sleeve 15, the upper end of which is interiorly screw threaded at 16 to engage the threads on the shoulder 12 of the plunger and also to engage the threads on the flange 5 surrounding the upper portion of thebarrel 1. The lower end of the sleeve 15 is pro-355 vided with an inner peripheral flange 17, which serves as a stop to engage the shoulder 5 on the barrel in the filling operation.

In Fig. 1, the parts are adjusted to their relative positions, when the pen is not in use; that is to say, the sleeve l5 has been rotated to cause the threads 16 .to take up on the threads 5 on the flange on the upper end of the barrel 1 to move the valve at the lower end of the plunger 10 into engagement with 65 the valve seat on the plug, thereby sealing the feed duct 7 against the entry of ink contained within the hollow plunger. When the pen is to be used, the sleeve 15 is given a A partial rotation in the opposite direction, so that the threads 16 on the sleeve engaging the threads 5 on the barrel will causeV the plunger 10 to be rotated at the same extent as the sleeve, to which it is attached, and also to move longitudinally ofy the barrel and move the valve 14 on the end of the plunger out of engagement with thek valve seat 8 on `the plug 6, thereby uncovering the feed duct 7 and permitting the ink to flow to the nib i 9, so that, when the cap 2O is removed from 80 the lower end of the barrel, the pen is ready for operation. In order to' fill the pen, the

sleeve 15 isA rotatedl to disengage the threads on the flange 5 and the interior threads 16, so that'the plunger 10 and the sleeve are free `35 to move longitudinally of the barrel. The

vpen endV is dipped into the ink and the plunger is pulled upwardly in the barrel and the gradually increasing space within the barrel and the plunger causes a reduction of the atmospheric pressure, so that the ink will be forced through the duct 7 in the plug 6 into said space. The outward movement of the plunger 10 lwith respect to the barrel 1 is limited by the iiange or shoulderv 17 on 95 the lower end of the sleeve 15 engaging the flange' 5 on the upper end of the barrel. Vhen the movement of the plunger is thus arrested, the full complement of ink has been drawn into the barrel andthe plunger, so 1 Y that the barrel contains a body of ink and the plunger is practically filled with air. The pen is then reversed, causing the ink to flow into the bore of the plunger and the air to rise in the barrel. Then, by moving the plunger into the barrel, the air will be expelled through the feed duct 7. As the plunger approaches the end of its telescoping movement into the barrel and the threads 16 on the interior of the sleeve 15 encounter the threaded flange 5 on the upper end of the barrel, the sleeve and the plunger are rotated to engage the threaded portions and this rotation of the sleeve and barrel may be continued until the valve 14: on the end of the plunger engages the valve seat 8 on the plug 6. When the pen is to be used, the sleeve 15 is given a partial rotation having the effect of moving the sleeve along the barrel, by reason of the threaded engagement between the sleeve and the barrel and, as the plunger is moved with the Sleeve, the valve at the lower end of the plunger is moved away from the valve seat 8 and uncovers the feed duct 7, perniittingthe ink to flow to the nib.

It will be particularly noted that the arrangement of the parts indicated provides a pen of optimum ink capacity and that may be readily lled by the simple expedient of releasing the sleeve 15 from the barrel, then moving the plunger longitudinally of the barrel, so that the latter acts as a pump to draw; the ink into the body of the pen, then reversing the position of the pen to` permit the ink to flow into the body of the plunger, moving the plunger within the barrel to expel the air, and finally turning the plunger and sleeve with respect to the barrel to effect a threaded engagement between the barrel and the sleeve as hereinbefore indicated. When it is desired to suspend the writing operation, the sleeve 15 is partially rotated on the barrel to move the plunger 10 longitudinally of the barrel and to cause the valve 14 on the plunger to seal and close the duct 7.

What I claim is:v i

1. A fount-ain pen, comprising a main barrel open at both ends and having a threaded exterior flange at its upper end, a feed plug fitting the other end and havinga valve seat on its inner end and a feed duct opening in said seat, a tubular plunger exteriorly threaded and closed at its upper end slidably mounted and in closely fitted engagement in said barrel and having a valve on its lower end cooperating with said seat to open and close the feed duct, and an exterior sleeve interiorly threaded at its upper end to engage the threads on the barrel and the plunger, said sleeve having means at its lower end to limit the outward movement of the plunger. l 2. A fountain pen, comprising a main barrel yopen at both ends and having a threaded exterior flange at its upper end, a feed plug limit the outward movement of the plunger.

In testimony whereof I affix my signature.

LLOYD A. BROOKE.

an Lin.. 

